The accuracy of blood loss estimation after simulated vaginal delivery

Paloma Toledo, Robert J. McCarthy, Bradley J. Hewlett, Paul C. Fitzgerald, Cynthia A. Wong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

114 Scopus citations


BACKGROUND: Visual blood loss estimation often underestimates blood loss. In this study we sought to determine the effect of calibrated drape markings on blood loss estimation in a simulated vaginal delivery. METHODS: Subjects were randomized to estimate simulated blood loss (300, 500, 1000, and 2000 mL) in calibrated or noncalibrated vaginal delivery drapes and then crossover. RESULTS: Visual blood loss estimation with noncalibrated drapes underestimated blood loss, with worsening accuracy at larger volumes (16% error at 300 mL to 41% at 2000 mL). The calibrated drape error was <15% at all volumes. CONCLUSIONS: Calibrated vaginal delivery drapes improve blood loss estimation.

Original languageEnglish (US)
Pages (from-to)1736-1740
Number of pages5
JournalAnesthesia and analgesia
Issue number6
StatePublished - Dec 2007

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

Cite this